Add support for auxiliary columns to the rtree extension.

FossilOrigin-Name: c6071ac99cfa4b6272ac4d739fc61a85acb544f6c1c2ae67b31e92aadcc995bd

diff --cc manifest
index 8659a25d5b7ef5d68ebab32fb4d3e1949766888b,707ba67441296ef743b82520b67090f19cdb2c79..a4a4960c57daaa6fe9198aefb32bf6c75c43221c
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C In\sthe\sCLI,\sdetect\sand\sreport\serrors\son\ssqlite3_close().\s\sClear\sglobal\nvariables\sprior\sto\sexit\sto\sso\sthat\svalgrind\scan\sbetter\sdetect\sresource\nleaks.
- D 2018-05-18T17:11:50.887
 -C Merge\senhancements\sfrom\strunk,\sespecially\sthe\sCLI\sfixes.
 -D 2018-05-18T17:17:36.604
++C Add\ssupport\sfor\sauxiliary\scolumns\sto\sthe\srtree\sextension.
++D 2018-05-18T17:58:33.081
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F Makefile.in bfc40f350586923e0419d2ea4b559c37ec10ee4b6e210e08c14401f8e340f0da
@@@ -1728,7 -1729,7 +1729,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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++P e3b2e0a078b82ac6cd3c3312e8ac0983c1375e1052f1e324476d2f8d1b227c30 a350040a3bb962823f92908fb31cade52baf13eab90ef608ca3a8349e4c28c9d
+ R c67fcd3e8c429daa0c0bf5aeb356dbf0
++T +closed a350040a3bb962823f92908fb31cade52baf13eab90ef608ca3a8349e4c28c9d
  U drh
- Z d089a713f2ba352bce4662bcdd3c7d90
 -Z 66b7d64381807f753032bf250835a757
++Z 6ceb3a28c710c648a7e5cb8343e1c6ba

diff --cc manifest.uuid
index 0b799613c0e7faee8190aaa6ab2d68fa1196c1e8,ce4a1dd5d04c202bc9880bf5f8507610a09ee40e..9a25a0b8693f686b9e916f79f268a3f5d48de4be
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- e3b2e0a078b82ac6cd3c3312e8ac0983c1375e1052f1e324476d2f8d1b227c30
 -a350040a3bb962823f92908fb31cade52baf13eab90ef608ca3a8349e4c28c9d
++c6071ac99cfa4b6272ac4d739fc61a85acb544f6c1c2ae67b31e92aadcc995bd